Re: Horrendous DPC latency?

sorry, my post was obviously false alarm. i disabled the thinkpad battery icon in the taskbar, which only leaded to a better behaviour concerning the latency, but that was already reported previously.

lenovo has still something to do!

i tried to report it via email, but had apparently the wrong email adress. and they didn't forward my mail, nor they told me the right one. i guess you can only call the hardware support by phone, but i ain't got no phone, so i capitulated.

I've been sitting in firefox, surfing the web and using the trackpad, trackpoint over wireless with everything enabled (ie usb) and DPC latency checker has not had even ONE yellow bar!!! Havn't noticed any mouse issues either!

You still get your battery meter and CPU power control.

Bugs:

* CPU fan appears to be running on full, small price to pay I suspect, until someone can point out a way to control the fans via AHCI and NHC.

Re: Horrendous DPC latency?

Actually, all you really need to do is install Intel's latest Matrix Storage Manager driver on Intel's website, and you'll see significantly reduced DPC latency. Keep in mind Matrix Storage Driver is only for those who do *not* have turbo memory installed in their SLs. Those of you who have turbo memory, I hope and assume the same results when installing the latest turbo memory driver.

Re: Horrendous DPC latency?

Actually, all you really need to do is install Intel's latest Matrix Storage Manager driver on Intel's website, and you'll see significantly reduced DPC latency. Keep in mind Matrix Storage Driver is only for those who do *not* have turbo memory installed in their SLs. Those of you who have turbo memory, I hope and assume the same results when installing the latest turbo memory driver.

Regards,

Message Edited by lenovousersl500 on 03-15-2009 01:48 AM

Well, I just tried the new Matrix Storage Mgr. and have a few more spikes than I had previously.

I should have left it well enough alone. Now when I try to rollback the driver, the rollback option is grayed-out.

Any ideas on how to get back to my old driver? The "old one" had significantly better DPC results than this new one.

Re: Horrendous DPC latency?

Hi everyone, I've got pretty much the same problem, albeit not as bad as a few people here seem to be complaining about.

I get spikes whenever applications are opening or when scrolling large sites in Firefox (pegged to the top of the graph, like 30,000us+) very quickly with "Standard Scrolling" enabled on the Ultranav stick (that's actually the only sure-fire way to get a red bar - open a site like slashdot.org with 300+ comments/posts, and then hold the middle button and scroll all the way to the bottom of the page in one go)

Other than that, I don't have a lot of problems (even though this one is very annoying - everything's fine when the machine is idle, but as soon as you start working on something or surfing the web... everything goes to **bleep**) - mostly hovers between 40 and 150 us, mostly <60 if the machine is idle. This is with a relatively clean install of XP Pro SP3 (Ultranav driver and utility, power management driver and software, hotkey drivers, sound + video drivers...).

Has anyone seen any improvement with an external (USB or FireWire) audio interface? Or an Expresscard device?

Re: Horrendous DPC latency?

I just tried deactivating all the power saving options in the BIOS, and that lowered my idle latency to around 20us - which is awesome, but I'm still getting spikes in the red every now and then... rather strange.

-edit- Strange, I'm still getting the spikes in the DPC Latency Checker, but no audio glitches corresponding to the spikes - there are still glitches every now and then, but the DPC Latency Checker doesn't show spikes there... WTF?

Re: Horrendous DPC latency?

Wow, this just keeps getting better and better - Uninstalling the nVidia video driver results in pristine audio quality... is there a different version that one might install (the newest nVidia driver packages won't install on Lenovo notebooks)?